Glass electrolyte composition
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsGene H. Kucera, Michael F. Roche
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Abstract
An ionically conductive glass is disclosed for use as electrolyte in a high temperature electrochemical cell, particularly a cell with sodium anode and sulfur cathode. The glass includes the constituents Na.sub.2 O, ZrO.sub.2, Al.sub.2 O.sub.3 and SiO.sub.2 in selected proportions to be a single phase solid solution substantially free of crystalline regions and undissolved constituents. Other advantageous properties are an ionic conductivity in excess of 2.times.10.sup.-3 (ohm-cm).sup.-1 at 300.degree. C. and a glass transition temperature in excess of 500.degree. C.
Claims9
An ionically conductive glass having an ionic conductivity in excess of 2.times.10.sup.-3 (ohm-cm).sup.-1 at 300.degree. C. comprising by mole %:
- 40-48% Na.sub.2 O
- 6-14% ZrO.sub.2
- 0.1-18% Al.sub.2 O.sub.3
- 30-52% SiO.sub.2
- said glass being substantially resistant to chemical attack by molten sodium metal, molten sulfur including polysulfides at electrochemical cell operating conditions of 300.degree.-400.degree. C.
Dependencies are inferred from the claim text.